SLAN-03D2A0 Datasheet, PDF (13/25 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /3 A Outputs
Mar. 16, 2012
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feature Descriptions
Remote On/Off
Parameter
Min
Typ
Max Unit
Notes
Signal Low (Unit On)
-0.2
-
0.4
V
Active Low
The remote on/off pin open, Unit on.
Signal High (Unit Off)
3.0
-
Vin,max
V
Signal Low (Unit Off)
-0.2
-
0.3
V
Active High
The remote on/off pin open, Unit on.
Signal High (Unit On)
3.0
-
Vin,max
V
The SLAN-03D2Ax power modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options
are available. In the Positive Logic On/Off option, (device code suffix “0” – see Ordering Information), the module
turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic
On/Off option, (device code suffix “L” – see Ordering Information),the module turns OFF during logic High and
ON during logic Low. The On/Off signal should be always referenced to ground. For either On/Off logic option,
leaving the On/Off pin disconnected will turn the module ON when input voltage is present.
For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 39. When the
external transistor Q1 is in the OFF state, the internal PWM Enable signal is pulled high through an internal
resistor and the external pullup resistor and the module is ON. When transistor Q1 is turned ON, the On/Off pin is
pulled low and the module is OFF. A suggested value for R_pullup is TBD.
Figure 39
TBD
Circuit configuration for using positive On/Off logic.
For negative logic On/Off modules, the circuit configuration is shown in Fig. 40. The On/Off pin should be pulled
high with an external pull-up resistor (suggested value for the 3V to 14.4V input range is 20Kohms). When
transistor Q1 is in the OFF state, the On/Off pin is pulled high, internal transistor Q4 is turned ON and the module
is OFF. To turn the module ON, Q1 is turned ON pulling the On/Off pin low, turning transistor Q4 OFF resulting in
the PWM Enable pin going high and the module turning ON.
Figure 40
VIN+
Rpullup
MOD UL E
ON/OFF
I _ON/OFF
+
V_ON/OFF
Q1
GND _
22K
22K
PWM Enable
Q4
CSS
Circuit configuration for using negative On/Off logic.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel [phone]  Fax [phone]  www.belfuse.com
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